Bertrandite and Pargasite Physical Properties

Bertrandite

Pargasite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.59-2.603.04-3.26

1 7.18

1.5 Fracture

Brittle, Metallic, Brittle, Metallic

Splintery, Brittle, Uneven

1.6 Cleavage

{001} Perfect, {110} Distinct, {101} Distinct

{110} perfect

1.7 Mohs Hardness

6-75-6

2 10

1.8 Chemical Composition

Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)

NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

Bertrandite and Pargasite Chemical Formula

While comparing Bertrandite and Pargasite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Bertrandite and Pargasite chemical formula.

Chemical formula of Bertrandite- Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Pargasite- NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

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Bertrandite and Pargasite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Bertrandite and Pargasite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Bertrandite and Pargasite Optical Properties during the identification of gemstone. Specific gravity of Bertrandite is 3.04-3.26 whereas that of Pargasite is 3.04-3.26.